In thiazides following substituent is essential for diuretic activity :
(A) Chloro group at position 6 (B) Methyl group at position 2
(C) Sulphamoyl group at position 7 (D) Hydrophobic group at position 3
(A) Chloro group at position 6 (B) Methyl group at position 2
(C) Sulphamoyl group at position 7 (D) Hydrophobic group at position 3